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import sys
import re
import functools
import distutils.core
import distutils.errors
import distutils.extension
from setuptools.extern.six.moves import map
from .dist import _get_unpatched
from . import msvc9_support
_Extension = _get_unpatched(distutils.core.Extension)
msvc9_support.patch_for_specialized_compiler()
def _have_cython():
"""
Return True if Cython can be imported.
"""
cython_impl = 'Cython.Distutils.build_ext',
try:
# from (cython_impl) import build_ext
__import__(cython_impl, fromlist=['build_ext']).build_ext
return True
except Exception:
pass
return False
# for compatibility
have_pyrex = _have_cython
class Extension(_Extension):
"""Extension that uses '.c' files in place of '.pyx' files"""
def _convert_pyx_sources_to_lang(self):
"""
Replace sources with .pyx extensions to sources with the target
language extension. This mechanism allows language authors to supply
pre-converted sources but to prefer the .pyx sources.
"""
if _have_cython():
# the build has Cython, so allow it to compile the .pyx files
return
lang = self.language or ''
target_ext = '.cpp' if lang.lower() == 'c++' else '.c'
sub = functools.partial(re.sub, '.pyx$', target_ext)
self.sources = list(map(sub, self.sources))
class Library(Extension):
"""Just like a regular Extension, but built as a library instead"""
distutils.core.Extension = Extension
distutils.extension.Extension = Extension
if 'distutils.command.build_ext' in sys.modules:
sys.modules['distutils.command.build_ext'].Extension = Extension
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